c4f7251860
A PDF does not contain paragraphs. It contains glyphs with coordinates, and there is no heading, no list, no table and no guaranteed reading order — only runs of characters that happen to sit near each other. Converting to Word means working out where the paragraphs were, from geometry. That inference is the whole feature, and it is sometimes wrong, so this is called a conversion and never an edit, and the dialog reports what it found before anything is written. Lines are grouped by baseline, runs joined with the spaces a PDF only implies by leaving a gap, and paragraphs ended where the next line sits unusually far below, is indented, or where the previous one stopped short of the measure. Headings come from size relative to the body — which is the most common size on the page, not the average, because a page of 11 pt under a 28 pt title averages to something that is neither. Bold and italic come from the font's name, the only place a PDF records them. What it refuses to fake is as important. A page set in columns is reported, not silently interleaved. A page with no text says so, and says why: it is an image of writing, and reading that needs character recognition this editor does not have. Tables become plain paragraphs rather than an invented grid, because a wrong table is harder to repair than no table. The .docx is written here rather than by a vendored builder: a Word file is a zip of five XML parts, and the subset that can honestly be produced — paragraphs of styled runs — is about two hundred lines. Vendoring a document library would have added another megabyte on top of the four pdf.js and pdf-lib already weigh, to generate markup we would still have to get right. Entries are stored rather than deflated, which keeps a compressor out of the add-on; the CRCs are the part that cannot be skipped, since Word calls the file corrupt rather than naming the part that upset it. Text replaced in place converts as replaced. Converting would otherwise hand back the words the user had just edited away. Checked by taking the output apart — every CRC verified, both XML parts run through a real parser — and then, because that is still marking my own homework, by opening the result in the Word editor extension, where mammoth reads it with none of my code involved.
283 lines
16 KiB
HTML
283 lines
16 KiB
HTML
<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<title>PDF Editor</title>
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<link rel="stylesheet" href="vendor/pdfjs/web/pdf_viewer.css">
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<link rel="stylesheet" href="editor.css">
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</head>
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<body data-empty="1">
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<!-- Top bar: document identity on the left, destructive/close actions right.
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Same split as the screenshot editor's topbar. -->
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<div class="topbar">
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<button class="btn wide" id="open" title="Open a PDF (Ctrl+O)">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M2 5h4l1.5 2H14v6H2z"/><path d="M2 5V3h5"/></svg>
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<span>Open</span>
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</button>
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<span class="sep"></span>
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<span class="docname" id="docname">No document</span>
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<span class="spacer"></span>
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<button class="btn wide" id="convert" title="Convert this document to an editable Word file" disabled>
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M3 2h6l4 4v8H3z"/><path d="M9 2v4h4"/><path d="M5.5 8.5l1 3 1.5-3 1.5 3 1-3"/></svg>
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<span>Convert to Word…</span>
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</button>
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<button class="btn wide primary" id="save" title="Save a copy (Ctrl+S)" disabled>
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M8 2v9M4 7l4 4 4-4M2 14h12"/></svg>
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<span>Save a copy</span>
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</button>
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<button class="btn danger" id="discard" title="Close this tab without saving (Esc)">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round"><path d="M4 4l8 8M12 4l-8 8"/></svg>
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</button>
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</div>
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<!-- Tool bar. `.tool-cluster` centres the drawing groups so the view
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controls can right-anchor without the tools crowding the left edge. -->
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<div class="toolbar" id="toolbar">
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<div class="tool-cluster">
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<div class="tgroup" role="group" aria-label="Tools">
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<button class="tool active" data-tool="select" title="Select — move or delete a mark, select text (V)">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M3 2l4 11 1.6-4.4L13 7z"/></svg>
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</button>
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<button class="tool" data-tool="highlight" title="Highlight — drag across text (H)">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M3 12h10"/><path d="M5 9.5l4.5-6.5 3 2L8 11.5z"/></svg>
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</button>
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<button class="tool" data-tool="underline" title="Underline — drag across text (U)">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round"><path d="M4 2v5a4 4 0 0 0 8 0V2"/><path d="M3 14h10"/></svg>
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</button>
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<button class="tool" data-tool="strikeout" title="Strike through — drag across text (K)">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round"><path d="M4 3.5h8"/><path d="M8 3.5V12"/><path d="M2.5 8h11"/></svg>
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</button>
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<button class="tool" data-tool="pen" title="Pen — freehand (P)">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M2 14c1-3 3-6 6-8s5-3 6-3l-3 4c-2 1-4 3-6 4s-2 2-3 3z"/></svg>
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</button>
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<button class="tool" data-tool="rect" title="Rectangle (R)">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5"><rect x="2.5" y="3.5" width="11" height="9"/></svg>
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</button>
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<button class="tool" data-tool="ellipse" title="Ellipse (O)">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5"><ellipse cx="8" cy="8" rx="5.5" ry="4"/></svg>
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</button>
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<button class="tool" data-tool="line" title="Line (L)">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round"><path d="M3 13L13 3"/></svg>
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</button>
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<button class="tool" data-tool="arrow" title="Arrow (A)">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round"><path d="M3 13L13 3M13 3H8M13 3v5"/></svg>
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</button>
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<button class="tool" data-tool="text" title="Text stamp (T)">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round"><path d="M3 3h10M8 3v10M6 13h4"/></svg>
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</button>
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<button class="tool" data-tool="edittext" title="Replace the document's own text (E)">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M2 4h7M5.5 4v7"/><path d="M11.5 3.5l2 2L9 10l-2.5.5L7 8z"/><path d="M2 14h12"/></svg>
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</button>
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<button class="tool" data-tool="signature" title="Signature stamp (G)">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.4" stroke-linecap="round" stroke-linejoin="round"><path d="M2 11c2 0 3-7 4.5-7S8 10 9.5 10 12 6 13.5 6"/><path d="M2 14h12"/></svg>
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</button>
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<button class="tool" data-tool="redact" title="Redact — drag a box over content to remove it" data-warn="1">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5"><rect x="2.5" y="4.5" width="11" height="7" fill="currentColor"/></svg>
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</button>
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</div>
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<div class="tgroup" role="group" aria-label="Colours">
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<button class="swatch active" data-color="#ffd400" style="background:#ffd400" title="Yellow"></button>
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<button class="swatch" data-color="#ff3b30" style="background:#ff3b30" title="Red"></button>
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<button class="swatch" data-color="#0aa8ff" style="background:#0aa8ff" title="Blue"></button>
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<button class="swatch" data-color="#2bd97c" style="background:#2bd97c" title="Green"></button>
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<button class="swatch" data-color="#1a1f2b" style="background:#1a1f2b" title="Ink"></button>
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</div>
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<div class="tgroup" role="group" aria-label="Widths">
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<button class="width" data-width="1.5" title="Thin"><span class="dot" style="width:4px;height:4px"></span></button>
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<button class="width active" data-width="2.5" title="Medium"><span class="dot" style="width:7px;height:7px"></span></button>
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<button class="width" data-width="4.5" title="Thick"><span class="dot" style="width:11px;height:11px"></span></button>
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<button class="btn" id="toggle-fill" title="Fill shapes as well as outline them">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5"><rect x="2.5" y="3.5" width="11" height="9"/><path d="M2.5 9.5h11v3h-11z" fill="currentColor" stroke="none"/></svg>
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</button>
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</div>
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<div class="tgroup" role="group" aria-label="History">
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<button class="btn" id="undo" title="Undo (Ctrl+Z)" disabled>
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round"><path d="M3 8c0-3 2-5 5-5s5 2 5 5-2 5-5 5"/><path d="M6 5L3 8l3 3"/></svg>
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</button>
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<button class="btn" id="redo" title="Redo (Ctrl+Shift+Z)" disabled>
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round"><path d="M13 8c0-3-2-5-5-5S3 5 3 8s2 5 5 5"/><path d="M10 5l3 3-3 3"/></svg>
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</button>
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</div>
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</div>
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<div class="tgroup zoomgroup" role="group" aria-label="Zoom">
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<button class="btn" id="zoom-out" title="Zoom out (−)">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round"><path d="M3 8h10"/></svg>
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</button>
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<select id="zoom" title="Zoom">
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<option value="page-width">Fit width</option>
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<option value="page-fit">Fit page</option>
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<option value="0.5">50%</option>
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<option value="0.75">75%</option>
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<option value="1">100%</option>
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<option value="1.25">125%</option>
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<option value="1.5">150%</option>
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<option value="2">200%</option>
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<option value="4">400%</option>
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</select>
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<button class="btn" id="zoom-in" title="Zoom in (+)">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round"><path d="M8 3v10M3 8h10"/></svg>
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</button>
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<button class="btn" id="toggle-rail" title="Show or hide the page thumbnails">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5"><rect x="2" y="2" width="7" height="12"/><rect x="11" y="2" width="3" height="5"/><rect x="11" y="9" width="3" height="5"/></svg>
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</button>
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</div>
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</div>
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<div class="body">
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<!-- Scroll container. pdf.js's own CSS keys off #viewer .page, and reads
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--scale-factor from the container, so the structure below mirrors what
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the pdf.js viewer builds. -->
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<div class="viewerContainer" id="viewerContainer">
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<div id="viewer" class="pdfViewer"></div>
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<div class="dropzone" id="dropzone">
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<div class="dz-inner">
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<svg viewBox="0 0 48 48" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round">
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<path d="M12 6h16l8 8v28H12z"/><path d="M28 6v8h8"/><path d="M24 22v12M19 29l5 5 5-5"/>
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</svg>
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<div class="dz-title">Drop a PDF here</div>
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<div class="dz-sub">or <button class="linkish" id="open2">choose a file</button></div>
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</div>
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</div>
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</div>
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<!-- Page rail. Thumbnails are draggable to reorder; each carries rotate
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and delete buttons. -->
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<aside class="rail" id="rail">
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<div class="rail-head">
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<span id="rail-count">0 pages</span>
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<button class="fbtn" id="restore-pages" hidden title="Bring back every deleted page">Undo deletes</button>
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</div>
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<div class="rail-list" id="rail-list"></div>
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</aside>
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</div>
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<div class="footer">
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<span class="fstat" id="status">Ready</span>
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<span class="spacer"></span>
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<span class="fstat" id="pageinfo"></span>
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</div>
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<!-- Modal shell, reused by the redaction warning, the signature pad and the
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text-stamp prompt. One at a time; `data-modal` names the open one. -->
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<div class="scrim" id="scrim" hidden>
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<div class="modal" id="modal-redact" hidden>
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<h2>About redaction</h2>
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<p>A redaction box hides content visually. On its own it does <strong>not</strong> remove the
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text underneath, which stays extractable by anyone who copies from the file.</p>
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<p>To actually remove it, this editor rebuilds each redacted page as an image when you save.
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That page's text stops being selectable and any form fields on it become static. Pages you
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did not redact are untouched.</p>
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<label class="check"><input type="checkbox" id="redact-flatten" checked>
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<span>Rebuild redacted pages as images when saving (recommended)</span></label>
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<div class="mrow">
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<button class="btn wide" id="redact-cancel">Cancel</button>
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<button class="btn wide primary" id="redact-ok">Use the redaction tool</button>
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</div>
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</div>
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<div class="modal" id="modal-sign" hidden>
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<h2>Draw your signature</h2>
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<p class="mhint">Draw in the box, then place it on the page. It is stored as lines, not a
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picture, so it stays sharp at any zoom.</p>
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<canvas id="sign-pad" width="640" height="220"></canvas>
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<div class="mrow">
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<button class="btn wide" id="sign-clear">Clear</button>
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<span class="spacer"></span>
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<button class="btn wide" id="sign-cancel">Cancel</button>
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<button class="btn wide primary" id="sign-ok" disabled>Use this signature</button>
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</div>
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</div>
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<div class="modal" id="modal-text" hidden>
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<h2 id="modal-text-title">Text stamp</h2>
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<textarea id="text-body" rows="4" placeholder="Type the text to place…"></textarea>
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<div class="mrow">
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<label class="mfield" id="text-size-field">Size
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<select id="text-size">
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<option value="8">8</option><option value="10">10</option>
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<option value="12" selected>12</option><option value="14">14</option>
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<option value="18">18</option><option value="24">24</option>
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<option value="36">36</option><option value="48">48</option><option value="72">72</option>
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</select>
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</label>
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<button class="btn styl" id="text-bold" type="button" title="Bold"><b>B</b></button>
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<button class="btn styl" id="text-italic" type="button" title="Italic"><i>I</i></button>
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<span class="spacer"></span>
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<button class="btn wide" id="text-cancel">Cancel</button>
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<button class="btn wide primary" id="text-ok">Place</button>
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</div>
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<p class="mhint" id="text-note" hidden></p>
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<p class="mhint" id="text-warn" hidden></p>
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</div>
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<div class="modal" id="modal-convert" hidden>
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<h2>Convert to Word</h2>
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<p>A PDF stores glyphs with coordinates, not paragraphs. Converting means working out
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where the paragraphs were, so the result is a <strong>rebuilt</strong> document that reads
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the same rather than a copy that looks the same.</p>
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<label class="mfield block">File name
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<input type="text" id="convert-name" spellcheck="false">
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</label>
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<ul class="summary" id="convert-summary"></ul>
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<div class="mrow">
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<span class="spacer"></span>
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<button class="btn wide" id="convert-cancel">Cancel</button>
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<button class="btn wide primary" id="convert-go">Convert</button>
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</div>
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</div>
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<div class="modal" id="modal-save" hidden>
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<h2>Save a copy</h2>
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<label class="mfield block">File name
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<input type="text" id="save-name" spellcheck="false">
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</label>
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<ul class="summary" id="save-summary"></ul>
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<div class="mrow">
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<span class="spacer"></span>
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<button class="btn wide" id="save-cancel">Cancel</button>
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<button class="btn wide primary" id="save-go">Save</button>
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</div>
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</div>
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</div>
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<!-- Pinned to the current selection; see paintSelectionBar in editor.js. -->
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<div class="selbar" id="selbar" hidden>
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<button class="sb" id="sb-edit" title="Edit this text (or double-click it)">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M11 2.5l2.5 2.5L6 12.5 3 13l.5-3z"/></svg>
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</button>
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<span class="sb-group" id="sb-textsize">
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<button class="sb" id="sb-smaller" title="Smaller">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round"><path d="M3.5 8h9"/></svg>
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</button>
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<span class="sb-val" id="sb-size">12</span>
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<button class="sb" id="sb-bigger" title="Bigger">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round"><path d="M8 3.5v9M3.5 8h9"/></svg>
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</button>
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</span>
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<button class="sb" id="sb-bold" title="Bold"><b>B</b></button>
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<button class="sb" id="sb-italic" title="Italic"><i>I</i></button>
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<button class="sb" id="sb-fill" title="Fill">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5"><rect x="2.5" y="3.5" width="11" height="9"/><path d="M2.5 9.5h11v3h-11z" fill="currentColor" stroke="none"/></svg>
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</button>
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<span class="sb-sep"></span>
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<button class="sb" id="sb-dup" title="Duplicate">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.5"><rect x="5.5" y="5.5" width="8" height="8" rx="1"/><path d="M3.5 10.5V3a1 1 0 0 1 1-1H11"/></svg>
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</button>
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<button class="sb danger" id="sb-del" title="Delete (Del)">
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<svg viewBox="0 0 16 16" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round"><path d="M3 4h10"/><path d="M6 4V2h4v2"/><path d="M4 4l1 10h6l1-10"/><path d="M7 6.5v5M9 6.5v5"/></svg>
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</button>
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</div>
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<div class="toast" id="toast"></div>
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<input type="file" id="file-input" accept="application/pdf,.pdf" hidden>
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<a id="download-link" style="display:none"></a>
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<script type="module" src="editor.js"></script>
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</body>
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</html>
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